Overcoming negative image of one's self, caused by stuttering?

Overcoming negative image of one's self, caused by stuttering? Hello, Some days I just seem to block on every word. I have no idea why, and when these days come around it just drops my mood for an entire week. I feel like I am not in control of my own life sometimes, I just want to feel more in control. Does anyone have any advice, I know it's not my fault, but I honestly can't go on like this. It really does wear away at my soul.